Coupling components for electric machine

ABSTRACT

An electric machine has a rotor, bearing plates for the rotor, a stack of stator laminations affixed to the bearing plates and a winding mounted on the stator laminations. Each of a plurality of insulating members is mounted on a corresponding one of a plurality of attachments and recesses for holding the insulating members. Each of a plurality of socket connections is mounted on a corresponding one of the insulating members. Electrically conductive means are electrically connected at one end to each of the socket connections and are adapted to be connected at the other end of each to a component of the machine.

United States Patent Pieper [21] Appl. No.: 14,435

[30] Foreign Application Priority Data Mar. 4, 1969 Germany ..P l9 10868.0

[52] U.S. Cl ..3l0/7l, 310/238, 310/249 [51] lnt.Cl. [58] Field ofSearch...

..H02k 13/00 ..3 l0/7l, 233, 234, 8, 9, 241, 3l0/68.l, 68.4, 72, 249

[56] References Cited UNITED STATES PATENTS 1,240,585 9/1917 Lee..310/241 51 Jan. 18, 1972 3,182,218 5/1965 Videtic ..3l0/239 PrimaryExaminer-D. X. Sliney Attorney-Curt M. Avery, Arthur E. Wilfond, HerbertL.

Lerner and Daniel J. Tick 57 ABSTRACT An electric machine has a rotor,bearing plates for the rotor, a stack of stator laminations affixed tothe bearing plates and a winding mounted on the stator laminations. Eachof a plurality of insulating members is mounted on a corresponding oneof a plurality of attachments and recesses for holding the insulatingmembers. Each of a plurality of socket connections is mounted on acorresponding one of the insulating members. Electrically conductivemeans are electrically connected at one end to each of the socketconnections and are adapted to be connected at the other end of each toa component of the machine.

9 Claims, 7 Drawing Figures COUPLING COMPONENTS FOR ELECTRIC MACHINEDESCRIPTION OF THE INVENTION The invention relates to an electricmachine. More particularly, the invention relates to coupling componentsfor an electric machine. The electric machine may comprise, for example,a universal motor utilized in household appliances, office machines, orthe like, and including a stack of stator laminations connected tobearing plates or end shields of the rotor.

The mounting of an electric machine of the aforedescribed type has beenso effected prior to my invention, that the elec trical wiring of thewinding was provided after the wrapping of the stator and the mountingof the bearing plates. In order to accomplish this, it was necessary toinsulate the end turns, to solder the end turns to flexible electricallyconductive members or components, and to subsequently reinsulate thecomponents. The wiring of the winding was usually undertaken prior tothe casing of the winding, in order to provide the soldered ends withthe necessary stability, during the operation of the motor.

An object of the invention is to decrease the costs of mounting, as wellas manufacturing, of machines of the aforedescribed type, withoutimpairing their operational reliability. The wiring within the machineof my invention is considerably simplified. In a machine of this type,the invention lies in the provision of the stacks of stator laminationswith attachments and/or recesses for mounting the insulating members.The insulating members support the socket connections, which socketconnections are in electrical contact with electrically conductive meanswhich are connected to windings or other components of the machine. Thispermits the wiring of the stack of stator laminations completely priorto the final mounting of the electric machine, without solder orinsulating processes. Since the attachments and/or recesses of the stackof stator laminations themselves necessitate a special end plate, it ispreferable, in order to simplify the structure of the machine, toprovide such attachments and/or recesses on a bearing frame which ispositioned between said stack of stator laminations and the rotor and isconnected to the stator laminations.

It is basically known to provide a bearing frame between the stack ofstator laminations and the rotor. The bearing frame has profiled legs,arms, or extending portions, for clamping an intermediate insulatingmember therebetween. This is described in German Pat. No. DAS 1,278,598.

The principal object of the invention is to provide a new and improvedelectric machine having a new and improved arrangement of couplingcomponents which may be manufactured at reduced costs without impairmentof its operational reliability and which is of simple structure,inexpensive in manufacture and reliable, efficient and effective inoperation.

Another object of the invention is to provide an electric machine whichmay be wired completely prior to the final mounting of the motor,without soldering or insulating.

In accordance with my invention, the bearing frame having theattachments is coupled to the stack of stator laminations in aparticularly simple manner by means of flat legs, arms or extendingportions, which are inserted in dovetailed recesses formed through thestack of stator laminations and produced of arches. As a result, eachleg is inserted into the corresponding recess of the stack of statorlaminations in a manner whereby deformation of said stack of statorlaminations is prevented. Another preferred arrangement for coupling thebearing frame and the stack of stator laminations comprises theprovision of sawtoothshaped edges on the legs of the bearing frame. Thelegs having the sawtooth-shaped edges are inserted into the dovetailedrecesses formed in the stack of stator laminations, accompanied by aslight variation in shape.

The bearing frame which supports the attachments may comprise a punchedbent member. In such case, it is preferable that the recesses be formedin flat bent parts of the bearing frame and that such flat bent partshave slots formed therein extending from the edges thereof to suchrecesses. The slots accommodate the electrically conductive memberswhich are connected to the socket connections. The recesses are feasiblewithout additional outputs and may have a smaller opening width than theinsulating members in order to accommodate said insulating members by asimple snap-in of said insulating members. Each socket connection may beprovided with sawtooth-shaped edges on a portion thereof which may beinserted into a recess formed in a corresponding one of the insulatingmembers. The end turns may be connected to the socket connections bywelding. The carbon brushes of the electric machine are coupled to thesocket connections by counter socket connections connected to saidsocket connections via flexible electrical conductors, in order topermit the connection of the terminals of the electric machine withoutsoldering.

In accordance with the invention, an electric machine having a rotor,bearing plates for the rotor, a stack of stator laminations affixed tothe bearing plates and a winding mounted on the stator laminationscomprises a plurality of insulating members. A plurality of attachmentsand recesses hold insulating members. Each of the insulating members ismounted on a corresponding one of the attachments. Each of a pluralityof socket connections is mounted on a corresponding one of theinsulating members. Electrically conductive means are electricallyconnected at one end to each of the socket connections and are adaptedto be connected at the other end of each to a component of the machine.

A bearing frame is positioned between the stack of stator laminationsand the rotor, and the attachments and recesses are provided on thebearing frame.

The electrically conductive means are welded to the socket connections.

Each of the insulating members has a recess formed therein. Each of thesocket connections has a portion having sawtoothshaped edges insertedinto the recess of a corresponding one of the insulating members.

Each of a pair of counter socket connections is electrically connectedto a corresponding one of a pair of brushes. Each of the counter socketconnections is adapted to be coupled with a corresponding one of thesocket connections.

Each of the recesses has an opening thereto having a width smaller thanthat of each of the insulating members.

The stack of stator laminations has dovetailed recesses formed thereinand the bearing frame has a pair of flat legs which are inserted intothe recesses of the stack of stator laminations and couple the bearingframe to the stack of stator laminations. The legs of the bearing framehave sawtoothshaped edges.

The bearing frame comprises a punched bent component and has flat parts.The recesses are formed through the flat parts with slots extending fromeach of the recesses to the edge of the corresponding flat part of thebearing frame. The slots accommodate the electrically conductivemembers.

In order that the invention may be readily carried into effect, it willnow be described with reference to the accompanying drawings, wherein:

FIG. 1 is a sectional view of an embodiment of a bearing frame of theelectric machine of the invention;

FIG. 2 is a top view of the bearing frame of FIG. 1;

FIG. 3 is a perspective schematic diagram of a leg of the bearing frameof FIGS. 1 and 2;

FIG. 4 is a schematic diagram of the stack of the stator laminations andbearing frame of the electric machine of the invention;

FIG. 5 is a schematic diagram of the entire assembled electric machineof the invention;

FIG. 6 is a view, partly in section, of an insulating member and asocket connection of the electric machine of the invention, on anenlarged scale; and

FIG. 7 is a top view of the insulting member and'socket connection ofFIG. 6.

In the FIGS., the same components are identified by the same referencenumerals.

In FIG. 1, a stack of stator laminations 1 is affixed to a bearing frame2 in an electric machine. The bearing frame 2 has an opening or bore 3which accommodates a bearing for the rotor of the machine (not shown inFIG. 1). The bearing frame 2 has bent flat parts 4a and 4b whichfunction to couple a bearing plate 5 (FIG. 5) and a plurality ofattachments 6, 7, 8 and 9, and recesses 10 (FIG. 2) to the electricmachine. The recesses 10 accommodate insulating members, hereinafterdescribed in detail.

The bearing frame 2 has a pair of spaced flat legs, arms or extendingmembers 11a and 11b which are utilized to couple said bearing frame tothe stack of stator laminations 1. Each of the legs may havesawtooth-shaped edges 12 formed thereon, as illustrated in FIG. 3 forthe leg lIb. Each of the legs 11a and 11b of the bearing frame 2 isinserted into a corresponding one of dovetailed recesses formed in thestack of stator laminations 1.

Another arrangement for coupling the bearings frame 2 to the stack ofstator laminations 1 involves the arching of the legs 11a and 11b andthe insertion of said legs into corresponding dovetailed recesses formedthrough said stack of stator laminations. The legs 1 la and 1 lb aresubsequently flattened by radial pressure, so that their edges aretightly clamped in the corresponding dovetailed recesses.

The combination unit of the stack of stator laminations l and thebearing frame 2 is then preferably provided with a winding 13 (FIG. 4)having ends which are electrically connected to corresponding socketconnections. The ends of the winding may be welded to the correspondingsocket connections. As shown in FIG. 6, each socket connection 14 has aleg 24 about which the electrically conductive winding or wire may bewound and to which the ends 17a and 17b of such wire may be welded.

The ends 17a and 17b of the winding 13 are shown in FIG. 4. Each socketconnection 14 is mounted in a recess formed in a corresponding one of aplurality of insulating members 15, as shown in FIG. 6. The socketconnection 14 has an extending portion having sawtooth-shaped edgesformed therein and inserted into the corresponding recess of thecorresponding insulating member 15. Each insulating member 15 is mountedon a corresponding one of a plurality of attachments 16, as shown inFIG. 6, by a bayonet-type coupling. The attachments 16 are affixed tothe bearing frame 2.

The structure of the electric machine or motor of the invention isparticularly well suited for assembly line manufacture on a round tableinstallation. First, the socket connections 14 are inserted into thecorresponding insulating members 15. The insulating members 15 are thenaffixed to the bearing frame via the attachments 16. The bearing frame 2is then coupled or affixed to the stack of stator laminations l byinserting its legs 11 into the corresponding dovetailed recesses of saidstack of stator laminations or by inserting said legs in similarundercuts or accommodating recesses of said stack of stator laminations.The wire ends 17a, 17b, 17c and 17d are then electrically connected tothe corresponding socket connections 15a, 15b, 15c and 15d (FIG. 4) bymechanical means. The bearing plate 5 is then mounted on the assembly(FIG. 5).

Round insulating members may be utilized to replace the insulatingmembers 15. The round insulating members may be inserted into therecesses 10a, 10b, 10c and 10d of the attachments 6, 7, 8 ad 9 (FIG. 2).In order to accommodate the ends 17a, 17b, 17c and 17d of the winding inthe corresponding recesses 10a, 10b, 10c and 10d, said ends are passedthrough slots 18a, 18b, 18c and 18d formed in the attachments 6, 7, 8and 9, respectively, each extending from its corresponding recess to theedge of its corresponding attachment (FIG. 2). The dimensions of therecesses 10a, 10b, 10c and 10d are determined to enable the mounting ofthe insulating members 15a, 15b, 15c and 15d in the corresponding onesof said recesses and to maintain said insulating members firmly.

FIG. 5 is a view of the completely assembled electric machine of theinvention. The socket connections 14a, 14b, 14c and 14d are accessiblevia corresponding recesses 19a, 19b, 19c and 19d, formed through thebearing plate 5, from the outside. A pair of carbon brushes 20a and 20bare provided. The carbon brush 20a is electrically connected to thesocket connection 14c via a counter socket connection 21a which iscoupled to said socket connection by a bayonet-type coupling. The carbonbrush 20b is electrically connected to the socket connection 14b via acounter socket 21b which is coupled to said socket connection via abayonet-type coupling. The remaining socket connections 14a and 14d areelectrically connected to a power supply source for the electricmachine, after said machine is mounted.

In order to further simplify the mounting of the electric machine of theinvention, it is preferable to hold the counter socket connections 21aand 21b (FIG. 5) in the bearing plate 5 during he mounting of saidbearing plate whence they will come into electrical contact with thecorresponding socket connections 14c and 14b.

In the embodiment of the electric machine of the invention, as shown inFIG. 5, a capacitor 22 may be connected to eliminate interference. Thecapacitor 22 may be electrically connected either to the socketconnections of a pair of carbon brush guides 23a and 23b, or may beconnected, via double socket connections, to the socket connections 14cand 14b to which the carbon brushes 20a and 20b, respectively, areconnected.

It is evident from the foregoing description and from the FIGS., thatthe mounting provided for an electric machine of the invention may beeffected with very little expenditure, whereby additional flexibleelectrically conductive wires may be eliminated.

While the invention has been described by means of spec ific examplesand in specific embodiments, I do not wish to be limited thereto, forobvious modifications will occur to those skilled in the art withoutdeparting from the spirit and scope of the invention.

I claim:

1. A universal motor for household appliances, office machines, and thelike, having a rotor, bearing plates for the rotor, a stack of statorlaminations connected to the bearing plates, a winding supported on thestator laminations, a plurality of insulating members and plug andsocket connections electrically connected to the ends of the winding andsupported by the insulating members, said motor comprising a bearingframe'(2) affixed to the stack of stator laminations and havingattachments (6, 7, 8, 9 and 16) and recesses (10) accommodating theinsulting members.

2. A motor as claimed in claim 1, wherein the ends of the winding arewelded to said socket connections.

3. A motor as claimed in claim 1, wherein each of said insulatingmembers has a recess formed therein and each of the attachments is aplug having sawtooth-shaped edges insertable into the recess of acorresponding one of said insulating membets.

4. A motor as claimed in claim 1, further comprising a pair of brushesand a pair of counter socket connections each electrically connected toa corresponding one of said brushes and each adapted to be coupled witha corresponding one of said socket connections.

5. A motor as claimed in claim I, wherein each of said recesses has anopening thereto having a width smaller than that of each of saidinsulating members.

6. A motor as claimed in claim 1, wherein said stack of statorlaminations had dovetailed recesses formed therein and said bearingframe has flat legs formed therein from bulges which are inserted intothe recesses of said stack of stator laminations and affix said bearingframe to said stack of stator laminations.

7. A motor as claimed in claim I, wherein said stack of statorlaminations has dovetailed recessed formed therein and said bearingframe has flat legs having sawtooth-shaped edges which are inserted withslight changes of shape into the recesses of said stack of statorlaminations and affix said bearing frame to said stack of statorlaminations.

8. A motor as claimed in claim 1, wherein said bearing frame comprises apunched bent component.

9. A motor as claimed in claim 1, further comprising electricallyconductive means electrically connected to the plug and socketconnections and wherein and said bearing frame has bent flat parts andsaid recesses are formed through said flat parts with slots extendingfrom each of said recesses to the 5 edge of the corresponding flat partof said bearing frame, said slots being adjacently positioned foraccommodating said electrically conductive means.

1. A universal motor for household appliances, office machines, and thelike, having a rotor, beariNg plates for the rotor, a stack of statorlaminations connected to the bearing plates, a winding supported on thestator laminations, a plurality of insulating members and plug andsocket connections electrically connected to the ends of the winding andsupported by the insulating members, said motor comprising a bearingframe (2) affixed to the stack of stator laminations and havingattachments (6, 7, 8, 9 and 16) and recesses (10) accommodating theinsulting members.
 2. A motor as claimed in claim 1, wherein the ends ofthe winding are welded to said socket connections.
 3. A motor as claimedin claim 1, wherein each of said insulating members has a recess formedtherein and each of the attachments is a plug having sawtooth-shapededges insertable into the recess of a corresponding one of saidinsulating members.
 4. A motor as claimed in claim 1, further comprisinga pair of brushes and a pair of counter socket connections eachelectrically connected to a corresponding one of said brushes and eachadapted to be coupled with a corresponding one of said socketconnections.
 5. A motor as claimed in claim 1, wherein each of saidrecesses has an opening thereto having a width smaller than that of eachof said insulating members.
 6. A motor as claimed in claim 1, whereinsaid stack of stator laminations had dovetailed recesses formed thereinand said bearing frame has flat legs formed therein from bulges whichare inserted into the recesses of said stack of stator laminations andaffix said bearing frame to said stack of stator laminations.
 7. A motoras claimed in claim 1, wherein said stack of stator laminations hasdovetailed recessed formed therein and said bearing frame has flat legshaving sawtooth-shaped edges which are inserted with slight changes ofshape into the recesses of said stack of stator laminations and affixsaid bearing frame to said stack of stator laminations.
 8. A motor asclaimed in claim 1, wherein said bearing frame comprises a punched bentcomponent.
 9. A motor as claimed in claim 1, further comprisingelectrically conductive means electrically connected to the plug andsocket connections and wherein and said bearing frame has bent flatparts and said recesses are formed through said flat parts with slotsextending from each of said recesses to the edge of the correspondingflat part of said bearing frame, said slots being adjacently positionedfor accommodating said electrically conductive means.